1. Jeffrey, G. B., Jeffrey, D.Sc., Jeffrey, M.A., Plane stress and plane strain in bipolar coordinates, Phil. Trans. Roy. Soc., London, A, 221, (1921), 265–293.
2. Mushkelishvili, N. I., Some Basic Problems of the Mathematical Theory of Elasticaty (1954).
3. Tang Ren-ji and Wang Kai, On the Griffith Crack Whose Surfaces Are Loaded Asymmetrically, Acta Mechanica Sinica Vol. 3, (1980), 269–278. (in Chinese)